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WARREN r. MILLEaoF Nnwronn, N. Y..

Letters Patent No. 81,812, dated September l, 1868.

IMPROVEMENT IN SAWS.

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'.rooALL wHoM 1r MAY concnnn:

Be it known that I, ,WARREN P. MILLER, ofthe city, county, and State of New York, have invented a new and useful Improvement in Saws; and I'do hereby declare that the following is a full, clear, and enact description ofthe construction and operation of the same, reference being had to the annexed drawings, making a part of this speciiication,'n which- Figure 1 represents a. section of a circular saw with the improved teeth.

' Figure 2 shows a ,sectionl of a straight saw, such as are used for cutting oli` logs, and like purposes, with my improved teeth. Y

Like lettersreier to -like parts on the drawings. Letters a a are the saw-plate. 4 Letters b show'the position of the teeth when filed down to the bottom of cavity. Letters c c c e, the points of -the teeth. Letters ci d d el, cavities between each set of teeth. Letters e c e e, base of the teeth. The object of this invention is to vproduce a saw -simple in construction, easily kept in order, and that will not need frequent gumming; and it consists in forming theteeth in pairs, of small dimensions, on a portion of the plate, with spaces between the different pairs of teeth, cut deep into. the saw-plate. These pairs of teeth are what are termed scoring-teeth, and are short from base to point, which form makes them much less liable to bend or spring laterally in the operation of sawing than Itho common tooth.

I prepare the saw-plates in the same manner, and of the 'same materials, as is used for saws when provided with teeth vof any of the known forms. I- lay oii the teeth in pairs or sets, as shown at e c c e, leaving a space between each pair equal to or greater in width than that comprising the two teeth, z'. e., one set of teeth, as shownat e e e e. The met-al occupying' the space at d oZ d d is then cut away, and also other portions of the saw-plate necessary to form the teeth c c e e, and leaving that portion of the saw-plate on which the pairs of teeth are formed with parallel sides, in order that, as thetecth are ledaway in keeping them sharp, they will always have a uniform size in width, till worn far into the saw-plate, and below the base of the teeth at the commencement, thus entirely doing away with the necessity of frequent and uncertain process of gumming, 4as

' in saws of common construction.

After the plates` are tempered, ground, and smithed, the teeth c c c a are filed ileaming, as shown, and each tooth of cach set is sprung laterally in opposite directions, so as to cut more than equal to the thickness ofthe pla'te.

' Theohject of locating the teeth inlpairs, and making them smaller than have heen heretofore used inthe First, that the-lateral resistance ofthe timber to the passage of the saw will apply at as nearly opposite points as possible on thesaw-plate. The teeth being the points where resistance applies, it is evident that, the lnearer the teeth are together, the less the plate will be affected by the side pressure.

Second,'being short from point to base, the teeth are rendered immensely st-ii'er laterally, and are enabled to retain the set-given them. v

Third, the spaces d d d are equal to one-half thestoek in the edge of the plate, and, having been cut away, reduce the amountA of filing in-a corresponding degree.

Fourth, it is known that tiling into the edge of a saw-plate ail'ects the stiffness and stability of it, and makes ite-hammering frequently necessary.l It will be observed that this improved sawcannot be affected by ling the teeth until the'saw is nearly worn out. 4"

' Fifth, for reason of the great lateral stiifness of saw-teeth when arranged in pairs, as shown, they will not dodge knots, nor follow the grain oi the timber, but cut straight and smooth, and run with less power than other saws.

I am aware that saws have been constructed with teeth in pairs, like what is seen in the Tuttle and Lippincctt saws, but such-saws have a slot eut deep into the plate, between' the points of such pairs of teeth. Such construction I wish to avoid, because the slot between such pairs of teeth elongates the teeth from their points to the bottom of the slot, making them just as liable to spring laterally as though they were long teeth, a defect that my improvement is calculated to entirely avoid.

I am also aware that saws have been constructed with sets of teeth, of three or more, rhaving a deep opening in the plate, between such sets of teeth, and having what is called a clearing-tooth in each set. Such construction I do not claim, as my improvement, in part, is to do away with the clearing-teeth;

What I do claim as new, and desire to secure by Letters Patent, is

A saw, with the teeth c c in pairs on base, e, having parallel sides, and deep spaces, d, between the pairs of teeth, constructed and arranged to operate in the manner and for the purpose described.

' WARREN P. MILLER.

Witnesses:

DAVID M. EDsALL, JN0. S. WooDwARD. 

